ABB S203MT-K20NAH10 miniature circuit breaker with K characteristic, 20 A rated current, 3P+N configuration and 10 kA breaking capacity for industrial, railway and automation circuit protection.
The ABB S203MT-K20NAH10 is a durable three-pole plus neutral (3P+N) miniature circuit breaker (MCB) designed to provide reliable overload and short-circuit protection for industrial, railway and transportation electrical systems. As part of the specialist ABB S200MT series, it is built for demanding low-voltage applications where dependable performance and safe circuit isolation are essential.
Featuring a K tripping characteristic, this miniature circuit breaker is suitable for circuits with higher inrush currents, including motors, transformers, contactors, coils and other inductive loads. Its tripping behaviour helps reduce nuisance interruptions while maintaining effective protection for connected equipment and wiring.
With a 20 A rated current, 3P+N configuration and 10 kA breaking capacity, the ABB S203MT-K20NAH10 is well suited to industrial control panels, OEM machinery, railway electrical systems and modular DIN rail distribution boards requiring compact and reliable circuit protection.
The ABB S203MT-K20NAH10 combines thermal overload protection with magnetic short-circuit protection to help safeguard cables, circuits and connected electrical equipment. Its K characteristic supports reliable operation where temporary inrush currents are expected during equipment start-up or switching.
Designed for demanding industrial and transportation environments, the S200MT range offers compact modular construction, dependable performance and compatibility with professional electrical panel layouts where safety, reliability and space-saving installation are essential.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K20NAH10 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 20 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Rated operational voltage | Up to 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated short-circuit breaking capacity | 10 kA |
| Frequency | 50 / 60 Hz |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
It is used to protect industrial, railway and automation circuits against overloads and short circuits, particularly where inductive loads and inrush currents are present.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for motors, transformers, coils and other inductive loads.
The ABB S203MT-K20NAH10 has a rated current of 20 A.
This miniature circuit breaker provides a rated short-circuit breaking capacity of 10 kA.
It is designed for DIN rail installation inside industrial control panels, distribution boards, railway systems and OEM machinery.
ABB S200MT miniature circuit breakers are trusted by panel builders, railway engineers and industrial automation specialists for dependable circuit protection, compact installation and long service life in demanding low-voltage systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...